JP3466110B2 - Projection lens optical axis visualization device, projection lens, projection display device, and installation adjustment method of projection display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the installation of a projection display device for facilitating installation adjustment work when stack projection is mainly performed using a plurality of projection display devices, and a projection lens optical axis visualization. The present invention relates to a device, a projection lens, and a projection display device.

[0002]

2. Description of the Related Art In order to obtain a large screen image, a method of forming an optical image according to an image signal on a light valve, irradiating the optical image with light, and enlarging and projecting it onto a screen by a projection lens is well known. Has been. Recently, a projection type display device using a liquid crystal panel as a light valve has been receiving attention (for example, Japanese Patent Laid-Open No. 62-133424).
The liquid crystal panel uses a twisted nematic (TN) liquid crystal as a liquid crystal material and an active matrix type in which a TFT is provided in each pixel as a switching element in order to obtain a high quality projected image. It is becoming mainstream to use three liquid crystal panels. Recently, the optical output of a projection display device has been significantly improved compared to the past due to improvements in the aperture ratio of liquid crystal panels and the development of high-luminance small lamps.

In order to make the projected image even brighter, a method of stacking the projected images on the screen by using a plurality of projection display devices (stack projection) is known (for example, Japanese Patent Laid-Open No. 107639/1993). Gazette). Stack projection is also used when a right-eye projection image and a left-eye projection image are projected using two projection display devices in order to perform stereoscopic display on a large screen.

FIG. 14 shows an example of stack projection using two projection display devices. The two projection display devices 1 and 2 are arranged vertically, and the lower projection display device 1 is arranged so that the optical axis 4 of the projection lens 3 passes through the lower end 7 of the projected image 6 on the screen. The optical axis 4 of the projection lens 3 is displaced upward with respect to the screen center 9 of the panel 8. Also in the projection type display device 2 on the upper side, the optical axis 13 of the projection lens 12 is shifted upward with respect to the screen center 11 of the liquid crystal panel 10 so as to be parallel to the optical axis 4 so that the two projected images overlap each other. In order to prevent the projection image 6 from being blocked by the projection display devices 1 and 2, two projection display devices 1 and 2 are used.
Is lower than the screen center 14 of the projected image 6. Since the projection images are overlapped by using two projection display devices, the projection image is twice as bright as when only one projection image is used.

[0005]

When performing stack projection using a plurality of projection display devices, it is necessary to superimpose a plurality of projection images on a screen. By the way, a projection display device using a liquid crystal panel as a light valve is
Since the liquid crystal panel has a pixel structure, it is not possible to freely transform the projected image by circuit adjustment as in a projection display device using a CRT. As a result of studying to reduce the pixel shift amount between corresponding multiple pixels, the distortion aberration of the projection lens is reduced, and the image forming surface of the light valve and the screen are arranged perpendicular to the optical axis of the projection lens. I found that I needed to.

It is necessary to grasp what the optical axis of the projection lens is with respect to the screen, but since the optical axis of the projection lens is not actually visible to the eye, installation adjustment for stack projection is performed. There is a problem that the work is very troublesome and takes a long time.

Even when stack projection is performed by using a plurality of CRT projection display devices of a type in which an image projected on a CRT is enlarged and projected by a projection lens, the convergence adjustment between sets is very troublesome. was there.

It is an object of the present invention to provide a method of installing and adjusting a projection display device for facilitating the installation and adjustment work of the projection display device in stack projection. It is another object of the present invention to provide a projection lens optical axis visualization device for facilitating installation adjustment of the projection display device, a projection lens, and a projection display device using the projection lens.

[0009]

The invention according to claim 1 of the present application comprises a light beam generating means for emitting a light beam of visible light,
A mounting means for mounting the light beam generating means on a projection lens is provided.

According to a second aspect of the present invention, in the projection lens optical axis visualization device according to the first aspect, when the mounting means mounts the light beam generating means on the projection lens, a light beam is emitted from the projection lens. It is characterized in that it is mounted at a position that advances along the optical axis.

In the light beam generation device, the light source may be attached at a position coinciding with the optical axis of the projection lens so that the light beam output from the light beam generation device coincides with the optical axis of the projection lens. A small mirror may be arranged at the position of the optical axis so that the light beam is incident on the mirror and the reflected light coincides with the optical axis.

According to a third aspect of the invention of the present application, in the projection lens optical axis visualization device according to the first aspect, the mounting means includes a light beam emitted from the light beam generating means and a projection image forming light emitted from the projection lens. It is characterized in that a part of the screen and the screen are made to reach the screen at the same time.

The mounting means arranges the light source part of the light beam generating means at the center position of the lens barrel of the projection lens and holds it at the center position by an arm or the like to increase the area not covered by the arm and to make it larger than the projection lens. The projection screen forming light and the visible light beam that are emitted can be configured to irradiate the screen at the same time.

According to a fourth aspect of the present invention, in the projection lens optical axis visualization device according to the first aspect, the light beam generation means includes a laser for emitting a visible light beam. Is.

According to a fifth aspect of the present invention, in the projection lens optical axis visualization device according to the fourth aspect, the light beam generating means converts a semiconductor laser that outputs visible light into parallel light that is output from the semiconductor laser. A collimator lens for conversion is provided.

According to a sixth aspect of the present invention, in the projection lens optical axis visualization device according to the first aspect, the mounting means mounts the light beam generating means on the projection lens, and then, the center of the lens barrel of the projection lens. It is characterized by being rotatable about an axis.

According to a seventh aspect of the present invention, in the projection lens optical axis visualization device according to the first aspect, the mounting means has an adjusting means for adjusting the emission direction of the light beam emitted from the light beam generating means. It is characterized by.

The mounting means has, for example, a cylindrical structure having an inner diameter equal to the outer peripheral portion of the lens barrel of the projection lens, and can be configured to be rotatable by sliding the outer wall of the lens barrel of the projection lens.

The light beam generating means may be arranged between the two lenses. The light beam generating means may use a laser that emits a visible light beam, and includes a semiconductor laser that outputs visible light and a collimator lens that converts the output light of the semiconductor laser into parallel light. It is desirable to do.

According to the invention of claim 8 of the present application, a lens barrel, a lens group held in the lens barrel for enlarging and projecting an image on a screen, and a light beam of visible light propagating on the optical axis of the lens group. And a part of the projection image forming light and the light beam emitted from the light beam generating means arrive on the screen at the same time.

The invention according to claim 9 of the present application is the projection lens according to claim 8, characterized in that the light beam generating means is disposed between two lenses of the lens group. is there.

According to a tenth aspect of the present invention, in the projection lens according to the eighth aspect, the light beam generating means includes a laser that emits a visible light beam.

The invention according to claim 11 of the present application is the projection lens according to claim 10, wherein the light beam generating means is a semiconductor laser that outputs visible light, and a collimator lens that converts the output light of the semiconductor laser into parallel light. It is characterized by having and.

According to a twelfth aspect of the present invention, in the projection lens according to the eighth aspect, the lens group is configured so that a part of the lens interval can be changed. The positional relationship between the lens through which the emitted light beam does not pass and the light beam generation means is fixed.

According to a thirteenth aspect of the present invention, a light source, a light valve on which light emitted from the light source is incident to form an optical image by a video signal, and light emitted from the light valve is incident on the light valve. The projection lens according to any one of claims 8 to 12, which projects the optical image formed on the screen onto a screen.

According to a fourteenth aspect of the present invention, a light source, a light valve which is emitted from the light source and forms an optical image by a video signal, and light emitted from the light valve is incident on the light valve. A projection lens for projecting an optical image formed on a screen onto a screen, and a projection lens optical axis visualization device attached to the projection lens so that a light beam of visible light travels along the optical axis of the projection lens.
A method of installing and adjusting a projection display apparatus, comprising: mounting a projection lens optical axis visualization device on the projection lens, wherein a light beam output from the projection lens optical axis visualization device is projected at a predetermined position on a screen. Thus, the position or direction of the projection display device is adjusted as described above.

According to a fifteenth aspect of the present invention, in the installation adjustment method for the projection type display device according to the fourteenth aspect, the light beam of the projection lens optical axis visualization device is at a predetermined position of a projection image formed on the screen. The position of the projection lens with respect to the light valve is adjusted so as to hit.

According to a sixteenth aspect of the present invention, a light source, a light valve which is emitted from the light source and forms an optical image by a video signal, and light emitted from the light valve is incident, the light valve A method for installing and adjusting a projection display device, comprising: a projection lens having a light beam generation means for projecting an optical image formed on a screen onto a screen and projecting a visible light beam along the optical axis thereof. The position or direction of the projection display device is adjusted so that the light beam emitted from the projection lens of the projection display device hits a predetermined position on the screen.

According to a seventeenth aspect of the present invention, in the method for installing and adjusting the projection type display device according to the sixteenth aspect, the projection lens for the light valve is arranged so that the light beam strikes a predetermined position of the projection image formed on the screen. The feature is that the position is adjusted.

The invention according to claim 18 of the present application is a method for adjusting the installation of a projection display device having a projection lens for projecting an optical image onto a screen, wherein the projection lens of the projection display device comprises the projection lens. 7. The projection lens optical axis visualization device according to any one of 7 above is mounted, and a plane mirror is arranged so as to be close to a screen so that a reflection surface is parallel to the screen, and light emitted from the projection lens optical axis visualization device. The position and direction of the projection display device are adjusted so that the beam is reflected by the plane mirror at a predetermined position on the screen and returns to the central portion of the projection lens optical axis visualization device. Is.

The invention according to claim 19 of the present application is a method for installing and adjusting a projection display device having a projection lens according to any one of claims 8 to 12, which projects an optical image on a screen. A plane mirror is arranged so that its reflection surface is parallel to the screen in the vicinity of, and the light beam emitted from the projection lens is reflected by the plane mirror at a predetermined position on the screen and the center of the projection lens. The position and the direction of the projection display device are adjusted so as to return to the section.

The invention of claim 20 of the present application is a method for installing and adjusting a projection type display device having a projection lens for projecting an optical image on a screen, wherein the projection according to any one of claims 1 to 7. A lens optical axis visualization device is arranged at a predetermined position on the screen so as to emit a light beam in a direction perpendicular to the screen, and the light beam emitted from the projection lens optical axis visualization device is a projection display device. The position of the projection display device is adjusted so as to hit the center of the projection lens, and the projection lens optical axis visualization device is attached to the projection lens so that the light beam hits a predetermined position on the screen. It is characterized by adjusting the direction of.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. (Embodiment 1) FIGS. 1 and 2 show Embodiment 1 of the present invention.
2 shows the configuration of the projection lens optical axis visualization device in FIG. The projection lens optical axis visualization device 51 includes a light beam generation device 21, a light beam generation device fixing member 22, a mounting ring 23, a semiconductor laser drive circuit 24, and a dry battery box 2.
It is configured to include 5. The light beam generation device 21, the semiconductor laser drive circuit 24, and the dry battery box 25 constitute a light beam generation means for emitting a light beam of visible light, and the light beam generation device fixing member 22 and the mounting ring 23 are the light beam generation means. To form a mounting means for mounting on the projection lens.

The light beam generator 21, as shown in FIG. 3, includes a semiconductor laser 28, a collimator lens 29, and a lens barrel 3.
0, mount 31. Semiconductor laser 28
Emits visible light, for example, red laser light having a wavelength of 635 nm. The collimator lens 29 is a single aspherical lens and converts the light emitted from the semiconductor laser 28 into a narrow light beam.

The mount 31 is a cylindrical member having a screw formed on the inner wall thereof, and a stepped portion 36 having a thick wall is formed inwardly on a part thereof. A semiconductor laser 28 and a fixing ring 32 are sequentially attached to the mount 31 from the rear side. A screw corresponding to a screw groove on the rear side of the mount 31 is provided on the outer periphery 33 of the fixing ring 32, and the semiconductor laser 28 is stably fixed to the mount 31 by the fixing ring 32. The lens barrel 30 is a cylindrical member that has a screw formed on the outer periphery and is rotatable inside the cylinder of the mount 31, and a collimator lens 29 that emits a light beam is attached to the opening 35 at the tip thereof. A coil spring 37 is arranged between the collimator lens 29 and the step portion 36 of the mount 31, and the lens barrel 30 is attached to the mount 31. The coil spring 37 fixes the collimator lens 29 at a predetermined position on the lens barrel 30. Since screws are provided on the outer circumference of the lens barrel 30 and the inner circumference of the mount 31, the lens barrel 3
When 0 is turned, the air gap between the semiconductor laser 28 and the collimator lens 29 is changed, so that the focus adjustment of the beam spot at the distant position of the emitted light beam can be performed. The front end of the lens barrel 30 is provided with a flange 27 having a knurled side surface to facilitate rotation adjustment.

In FIG. 1 and FIG. 2, the light beam generator 2
1 is attached to a light beam generator fixing member 22. The light beam generation device fixing member 22 is composed of a rotationally symmetric Y-shaped member 40 and a cylindrical member 41 at the center thereof, and the light beam generation device 21 described above is attached to the tip of the cylindrical member 41. . A ring-shaped mounting ring 23 having a large diameter is provided coaxially with the cylindrical member 41, and a step portion 42 is provided on the inner periphery thereof. The mounting ring 23 is for mounting the projection lens optical axis visualization device 51 on the tip of the projection lens barrel (not shown), and the rear end surface 48 of the stepped portion 42 is the end surface of the tip of the projection lens barrel. It comes into contact with. Further, the rear end surface 48 of the step portion 42 is parallel to the rear end surface 49. The stepped portion 42 of the mounting ring 23 is provided with screw holes 44 at three locations, and the stepped portion 42 of the Y-shaped member 40
Corresponding holes 45 are provided at one end.
An adjusting screw 46 is inserted through each of the three holes 45 of the Y-shaped member 40, and the adjusting screw 46 is inserted through the coil spring 47 into the screw hole 44 of the mounting ring 23. In this way, by turning the three adjusting screws 46, the traveling direction of the light beam emitted from the light beam generating device 21 held by the mounting ring 23 can be adjusted.

As shown in FIG. 2, a semiconductor laser drive circuit 24 is housed inside the cylindrical member 41, and a dry battery box 25 for housing dry batteries is provided around the mounting ring 23.
Is provided. The semiconductor laser drive circuit 24 supplies a constant current to the semiconductor laser 28, and uses two dry batteries as a power source. A switch 26 is attached to the dry battery box 25. When the switch 26 is turned on, the light beam is emitted from the light beam generation device 21.

The projection lens optical axis visualization device 51 shown in FIGS. 1 and 2 uses an arm-shaped Y-shaped member 40 for fixing the light beam generation device 21 at the center. Therefore, when the projection lens optical axis visualization device 51 is attached to the lens barrel of the projection lens, part of the image forming light emitted from the projection lens passes through the projection lens optical axis visualization device 51, and the projection image and the beam spot are displayed on the screen. And can be displayed.

FIG. 4 shows a projection display apparatus using a liquid crystal panel, and a projection lens optical axis visualization apparatus 51 shown in FIGS.
It shows a state in which is attached. This projection display device uses a liquid crystal panel as a light valve, and the projection lens can be moved in parallel in the screen vertical direction and the screen horizontal direction. Projection lens optical axis visualization device 51
Is attached to the tip of the projection lens 53 of the projection display device 52 for use. The inner diameter of the mounting ring 23 is slightly larger than the outer diameter of the distal end portion of the lens barrel of the projection lens 53, and the mounting ring 23 can be smoothly rotated concentrically with respect to the projection lens 53.

The projection lens optical axis visualization device 51 uses the adjustment method described later so that the beam spot becomes small at any irradiation distance, and with respect to the surface of the mounting ring 23 that contacts the tip surface of the projection lens. It is adjusted so that the light beam travels at a right angle. In general, the optical axis of the projection lens coincides with the central axis of the outer circumference of the projection lens barrel, and this central axis is at a right angle to the end face of the tip of the projection lens barrel, so the projection lens adjusted as described above. When the optical axis visualization device is attached to the projection lens, the light beam can be regarded as traveling on the optical axis of the projection lens.

In the projection lens optical axis visualization device shown in FIGS. 1 and 2, the light beam travels along the optical axis of the projection lens by being attached to the tip of the projection lens. It is possible to visualize the missing optical axis. Therefore, by using the projection lens optical axis visualization device, the intersection of the optical axis of the projection lens and the screen can be easily recognized. By utilizing this, the position or direction of the projection display device can be adjusted so that the position of the spot on the screen comes to a predetermined position.

Further, as described above, since the projected image and the beam spot can be displayed on the screen, the intersection of the optical axis of the projection lens and the liquid crystal panel can be recognized from the position of the beam spot on the projected image. be able to. By utilizing this, by moving the projection lens in parallel so that the light beam strikes a predetermined position on the projection image, the position of the projection lens with respect to the liquid crystal panel can be adjusted to the predetermined position.

In the projection lens optical axis visualization device 51, the beam spot is small at any irradiation distance, and the light beam must coincide with the optical axis of the projection lens 53. A method of adjusting the projection lens optical axis visualization device 51 so as to satisfy these conditions will be described.

In order to reduce the beam spot at any irradiation distance, the projection lens optical axis visualization device 51 is attached to the tip of the projection lens barrel, and the screen or wall as far away as possible is irradiated with the light beam, and It is advisable to rotate the lens barrel 30 of the beam generation device 21 so as to minimize the beam spot, and further to rotate the lens barrel 30 finely so that the beam spot is most divided into a plurality of stripes. In this way, it is not necessary to perform focus adjustment again at any irradiation distance.

In order to make the light beam coincide with the optical axis of the projection lens 53, the direction in which the light beam travels is perpendicular to the surface where the tip of the projection lens 54 contacts the mounting ring 23 of the projection lens optical axis visualization device 51. There is a need to. For this purpose, as shown in FIG.
5, the projection lens optical axis visualization device 51 is attached to the tip of the projection lens 53, and the light beam 57 is applied to the screen 56 arranged at a distant position. Rotate the mounting ring 23 of the projection lens optical axis visualization device 51 without moving the projection lens 53, and see the circle 58 drawn by the center of the beam spot on the screen 56 so that the diameter of the locus is sufficiently small. It is advisable to turn the adjusting screw 46 of the book for adjustment.
When making this adjustment, circle 5 drawn by the center of the beam spot
It is advisable to turn the adjusting screw 46 one by one so that the center of the beam spot gradually approaches the center 59 of the beam.

To confirm that the light beam can be regarded as traveling on the optical axis of the projection lens 53, as shown in FIG.
The projection lens 53 is placed on the V block 55, and the projection lens 5
It is advisable to fix the projection lens optical axis visualization device 51 at the tip of 3, and rotate the projection lens 53 to see the movement of the center of the beam spot.

It is ideal that the circle drawn by the center of the beam spot should be a stationary point, but this is difficult. However, since the optical axis of the projection lens passes through the center 59 of the circle 58 drawn by the center of the beam spot, the circle 58
If the diameter is small to some extent, the position of the optical axis of the projection lens 53 with respect to the beam spot can be sufficiently grasped.

As described above, in the projection lens optical axis visualization device of the present invention, the light beam emitted from the light beam generation device advances on the optical axis of the projection lens, and the optical axis or the optical axis invisible to the eyes of the projection lens. Since it is possible to visualize a line that can be regarded as, the intersection of the optical axis of the projection lens and the screen and the intersection of the optical axis of the projection lens and the light valve can be easily recognized. Therefore, by using the projection lens optical axis visualization device of the present invention, the installation adjustment of the projection display device can be easily performed.

(Embodiment 2) A method for adjusting the optical axis of the projection lens of the projection type display device so that the optical axis of the projection lens intersects the screen vertically at a predetermined position by using the projection lens optical axis visualization device of the present invention will be described. .

As shown in FIG. 6, the projection lens optical axis visualization device 63 is provided at the tip of the projection lens 62 of the projection display device 61.
Put on. The projection lens optical axis visualization device 63 itself is the same as the projection lens optical axis visualization device 51 of the first embodiment. Then, the plane mirror 65 is arranged at a predetermined position on the screen 64 so that the reflection surface is parallel to the screen 64. The position and direction of the projection display device 61 are set so that the light beam 66 emitted from the projection lens optical axis visualization device 63 is reflected at a predetermined position of the plane mirror 65 and returns to the projection lens optical axis visualization device 63. Adjust. This makes the optical axis of the projection lens visible,
Installation adjustment of the projection display device can be performed very easily.

(Embodiment 3) Another method of installing the projection display device at a predetermined position using the projection lens optical axis visualization device of the present invention will be described. The projection lens optical axis visualization device 71 used here is the same as that shown in the first and second embodiments, and the mounting ring 73 is also the same as the mounting ring 23 in FIGS. As mentioned above, the mounting ring 7
Surface 48 in contact with the front end surface of the projection lens 3 and rear end surface 49
Since and are parallel, the light beam is perpendicular to both face 48 and face 49.

As shown in FIG. 7, the projection lens optical axis visualization device 71 is arranged at a predetermined position on the screen 72 so that the rear end surface of the mounting ring 73 is parallel to the screen 72. The light beam 75 is projected onto the projection display device 76.
The position of the projection display device 76 is adjusted so that the light enters the center of the projection lens 77. Next, the projection lens optical axis visualization device 71 is attached to the projection lens 77, and the direction of the projection display device is adjusted so that the light beam enters a predetermined position on the screen. Also in this case, since the optical axis of the projection lens 77 is visualized, the installation adjustment of the projection display device can be performed very easily.

(Embodiment 4) FIG. 8 is a sectional view showing the structure of a projection lens according to Embodiment 4 of the present invention. In the figure, 81 is a projection lens barrel, 91 is a prism type mirror, and 92 is a light beam generation device. It should be noted that spacers and rings for holding the respective lenses are omitted for easy viewing of the drawing.

The projection lens according to the present embodiment has nine lenses 82, 83, 84 and 8 in a projection lens barrel 81.
5, 86, 87, 88, 89, 90 are arranged, a prism type mirror 91 is arranged between the two lenses 86, 87, and a light beam generation device 92 is provided on the outer surface of the projection lens barrel 81.
Are arranged.

As shown in FIG. 9, the prism type mirror 91 is formed by joining two prisms 93 and 94 together with a transparent adhesive so that their cross sections having an inclination of 45 ° with respect to the optical axis are joined together. It has a shape in which the four corners are arcs. A metal thin film 97 that reflects a light beam of visible light is vapor-deposited on a small area in the center of the bonding surface 96 of one prism 93. Since the metal thin film 97 is small and is located away from the light valve, it is less likely that a blurred image of the metal thin film 97 will appear on the screen.

The light beam generator 92 is the same as that shown in FIG. 3 except that the external shapes of the lens barrel 101 and the mount 102 are different. As shown in FIG.
A flange 103 having a gear-shaped periphery is provided in the.
The mount 102 is provided with a square flange 104 at the end. An end surface 105 of the flange 104 is a concave spherical surface, an elongated hole 106 is provided at a position corresponding to the gear-shaped portion of the flange 103, and holes 107 for inserting screws are provided at four positions of the end portion. There is.

As shown in FIG. 8, a pedestal 108 is provided on the side surface of the projection lens barrel 81 where the prism type mirror 91 is arranged. An outer surface 109 of the pedestal 108 is a convex spherical surface, and screw holes are provided at four end portions, and a through hole 111 is provided at a central portion. The radius of curvature of the spherical surface 109 of the pedestal 108 is the same as the radius of curvature of the end surface 105 of the mount 102. The light beam generation device 92 is attached to the projection lens barrel 81 with four screws.

The light beam emitted from the light beam generator 92 enters the prism type mirror 91, is reflected by the metal thin film 97, passes through the lenses 86, 85, 84, 83, 82 and is emitted to the outside.

The mount 102 of the light beam generator 92 is movable with respect to the pedestal 108, and the mutual contact surfaces are spherical. Therefore, by shifting the mounting position of the mount 102 with respect to the pedestal 108, the light beam generator 92 can be moved.
The direction of the light beam exiting from can be adjusted.
The radius of curvature of the spherical surfaces 105 and 109 is such that the light beam remains the metal thin film 9 of the prism type mirror 91 even when the mount 102 is moved.
It is set so as to enter 7. In this way, by adjusting the mounting position of the light beam generator 92,
The light beam emitted from the projection lens can be made to travel on the optical axis of the projection lens. If a thin rod is inserted into the elongated hole 106 of the mount 102 and the gear-shaped flange 103 is moved to rotate the lens barrel 101, the air gap between the semiconductor laser and the collimator lens can be changed. It is possible to adjust the focus of the beam spot at a position apart from the light beam emitted from.

The focus adjustment of the light beam in the projection lens shown in FIG. 8 and the adjustment to match the light beam with the optical axis of the projection lens may be performed in the same manner as the adjustment described with reference to FIG.

When the projection lens shown in FIG. 8 is used in a projection display device, the optical axis of the projection lens is visualized, so that the installation adjustment of the projection display device can be easily performed.

When the projection lens is a zoom lens, it is preferable that the lens through which the light beam does not pass does not move. By doing so, if the focus adjustment of the light beam is performed in a certain zoom state, the focus of the light beam can be made good in all zoom states.

(Fifth Embodiment) FIG. 11 shows the structure of a projection lens according to a fifth embodiment of the present invention.
In the figure, 121 is a projection lens barrel, and 131 is a light beam generation device. It should be noted that spacers and rings for holding the respective lenses are omitted for easy viewing of the drawing.

In the present embodiment, the projection lens barrel 12
9 lenses 122, 123, 124, 12 in one
5, 126, 127, 128, 129 and 130 are arranged, and the light beam generation device 131 is arranged at the center position between the two lenses 126 and 127.

The light beam generator 131 is the same as that shown in FIG. 3 except that the external shape of the lens barrel 133 is different. The lens barrel 133 has the same structure as that shown in FIG.
A flange 135 having a gear-like periphery is provided. The light beam generator 131 includes a light beam generator fixing member 13.
It is attached to the projection lens barrel 121 via 6. As shown in FIG. 12, the light beam generator fixing member 136 is composed of two large and small coaxial cylindrical members 137 and 138, and a thin radial plate member 139 connecting these cylindrical members 137 and 138. The outer diameter of the outer cylindrical member 137 is slightly smaller than the inner diameter of the corresponding portion of the projection lens barrel 121.
The mount of the light beam generation device 131 is inserted in the inner cylindrical member 138. Further, the cylindrical member 137 is provided with through holes 140 at three positions. Projection lens barrel 121
3 screw holes are provided at positions corresponding to the through holes 140 of FIG. Three screws 142 are inserted through the through hole 140 of the light beam generator fixing member 136 and a coil spring (not shown) into the screw hole 141 of the projection lens barrel.

Adjustment of the light beam generator is performed as follows.
Do this during the assembly of the projection lens. Projection lens barrel 121
After attaching the lenses 122, 123, 124, 125, 126 to the optical beam generator fixing member 136 having the optical beam generator 131, the projection lens barrel 1
21 is placed on the V block, and a light beam is applied to a screen arranged at a remote position. By moving the gear-like flange 135 with a thin rod to rotate the lens barrel 133, the beam spot on the screen is adjusted to be small. Next, the three screws 142 are rotated and adjusted so that the diameter of the circle drawn by the center of the beam spot on the screen becomes very small even if the projection lens barrel 121 is rotated.

A projection display device generally uses a concave mirror to collect light emitted from a lamp, and a window for penetrating the arc tube of the lamp is provided at the center of the concave mirror. When the outer diameter of the lens is large, the light output may not decrease even if the light beam generator is arranged inside the projection lens. In such a case, FIG.
As shown in, a light beam generator can be mounted inside the projection lens. Since the optical axis of the projection lens shown in FIG. 11 is also visualized, when it is used in a projection display device, the installation adjustment of the projection display device can be easily performed.

(Sixth Embodiment) FIG. 13 shows the structure of a stack projection type display device according to a sixth embodiment of the present invention. In the figure, 161 and 162 are projection display devices, 163 is a mount, and 167 and 168 are projection lenses.

As shown in FIG. 13, two projection display devices 161, 162 are placed on a lower plate 164 and an upper plate 165 of a frame 163, respectively. The pedestal 163 includes a frame 166 made of iron pipe, a lower plate 164 and an upper plate 165.
And are attached. Two projection display devices 16
1 and 162 are exactly the same, and use liquid crystal panels in which pixels are arranged in a matrix as light valves. The two projection lenses 167 and 168 have very small distortion, and can be moved in parallel in the screen vertical direction and the screen horizontal direction. Projection display devices 161, 162
On the lower side, legs 169 and 170 each having a variable height are provided.

When stack projection is performed using two projection display devices, it is necessary to make corresponding pixels of two projected images overlap. For this purpose, it is necessary that the distortion of the projection lens is very small and that the two projected images be rectangular with exactly the same size. In order to make the projected image rectangular, both the liquid crystal panel and the screen must be perpendicular to the optical axis of the projection lens. If both the liquid crystal panel and the screen are perpendicular to the optical axis of the projection lens, the projected image remains rectangular even if the projection lens is moved in parallel to the liquid crystal panel.
Generally, when a projection display device is assembled, the liquid crystal panel is adjusted to be perpendicular to the optical axis of the projection lens. However, it is necessary to make the screen perpendicular to the optical axis of the projection lens by adjusting the installation of the projection display device.

An installation adjustment method in the case of stacking two projection display devices arranged vertically will be described. First, the projection lens 1 of the lower projection display device 161
The projection lens optical axis visualization device 51 shown in FIG. Then, a crosshatch pattern is projected on a screen (not shown), and the projection lens 167 is moved horizontally and vertically so that the light beam 171 emitted from the projection lens optical axis visualization device 51 hits a predetermined position of the crosshatch pattern. By any of the two methods described with reference to FIGS. 6 and 7, the fine rotation adjustment in the horizontal plane of the projection type display device 161 and the leg 169 of the projection type display device 161 are performed so that the light beam passes vertically through a predetermined point on the screen. Adjust the height.
Also, the height of the leg 169 is adjusted to correct the horizontal inclination of the crosshatch pattern.

Next, the projection lens optical axis visualization device 51 is attached to the projection lens 168 of the upper projection display device 162, a crosshatch pattern is projected on the screen, and the light beam emitted from the projection lens optical axis visualization device is projected. The projection lens 168 is moved in the horizontal direction and the vertical direction so that 172 hits a predetermined position of the cross hatch pattern. Stand 1
63 is not moved, and the upper projection display device 16 is arranged so that the light beam 172 strikes a predetermined position on the screen.
2. Make fine rotation adjustment and elevation angle adjustment in the horizontal plane. At this time, the pitch of the projection lenses 67 and 168 is set to the projection type display device 1.
Since it is considered to be almost equal to the pitch of 61, 162,
The pitch of the two beam spots on the screen by the light beams 171 and 172 is determined by the projection display devices 161 and 162.
Set to be equal to the pitch of.

Next, a crosshatch pattern is projected from the two projection type display devices onto the screen, and the microscopic rotation adjustment and the leg 1 of the upper projection type display device 162 are adjusted so that the two crosshatch patterns overlap as much as possible.
The height adjustment of 70, the vertical and horizontal movements of the projection lens 168, and the horizontal inclination of the projection display device 162 are adjusted to perform convergence adjustment between sets.

Since the optical axis of the projection lens is visualized by using the projection lens optical axis visualization device, the optical axis of each projection lens and the screen can be surely made perpendicular to each other. As a result, the position and direction of the projection display device can be set to a state close to an ideal state before the convergence adjustment between sets is started, so that the condition for reducing the pixel shift between two projected images is satisfied. It will be. Therefore, the convergence adjustment between sets to be performed thereafter can be easily performed in a short time. in this way,
When the projection lens optical axis visualization device is used, the optical axis of the projection lens can be seen by the eye, which makes it easier for the operator to understand the overall state and facilitates installation adjustment when stack projection is performed. .

In this way, it is possible to easily obtain a projected image with less pixel shift and twice as bright as in the case where only one projection display device is used.

When three or more projection display devices are used for stack projection, the projection lens optical axis visualization device of the present invention is used as the reference projection display device, and the optical axis of the projection lens is a screen. Pass the specified position above vertically, and then attach the projection lens optical axis visualization device to the projection lens of another projection display device so that the optical axis of the projection lens moves to the specified position on the screen. It is preferable to repeat the work of adjusting the direction of the projection display device so that it passes through.

In addition, in the projection type display device shown in FIG.
Alternatively, even when the projection lens shown in FIG. 11 is used, the installation adjustment can be easily performed in a short time, the pixel shift is small, and a projection image twice as bright as when only one projection display device is used is provided. Can be easily obtained.

In the above description of each embodiment, the projection type display device using the liquid crystal panel as the light valve has been described, but the projection type display device using the light valve other than the liquid crystal panel, for example, the slide film, the motion picture film, etc. The installation adjustment method of the projection type display device, the projection lens optical axis visualization device, and the projection lens of the present invention can also be used in devices, slide projectors, movie projectors, and the like. In any case, of course, when projecting with one projection display device,
Even in the case of stack projection, the installation adjustment can be easily performed.

[0079]

As described above, according to the inventions of claims 1 to 7 of the present application, the optical axis projected from the projection lens can be visualized as it is by mounting the light beam generator on the projection lens. Therefore, the position and direction of the projection lens can be adjusted accurately. Further, according to the projection lens of claims 8 to 12, since the light beam generation device is attached to the projection lens having a lens group for enlarging and projecting an image on the screen, the position where the optical axes of the projection lenses intersect on the screen is accurately measured. It is possible to check and easily adjust the projection lens. Further, according to the projection display device of claim 13 and the installation adjustment method of claims 14 to 20 of the present application, a projection display device that facilitates installation adjustment of the projection display device, particularly installation adjustment in the case of stack projection. An installation adjustment method can be provided, and a projection lens optical axis visualization device for facilitating installation adjustment of a projection display device,
A projection lens and a projection display device using the projection lens can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a projection lens optical axis visualization device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a projection lens optical axis visualization device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a configuration of a light beam generation device used in the projection lens optical axis visualization device shown in FIG.

4 is a perspective view showing a state in which the projection lens optical axis visualization device shown in FIG. 1 is mounted on a projection lens.

5 is a perspective view showing a method for adjusting the projection lens optical axis visualization device shown in FIG. 1. FIG.

FIG. 6 is a perspective view showing an installation adjustment method for a projection display apparatus according to Embodiment 2 of the present invention.

FIG. 7 is a perspective view showing a method of installing and adjusting a projection display apparatus according to a third embodiment of the present invention.

FIG. 8 is a sectional view showing a configuration of a projection lens according to a fourth embodiment of the present invention.

9 is a perspective view showing a configuration of a prism type mirror used in the projection lens shown in FIG.

10 is a perspective view showing a configuration of a light beam generation device used in the projection lens shown in FIG.

FIG. 11 is a sectional view showing a configuration of a projection lens according to a fifth embodiment of the present invention.

12 is a perspective view showing a configuration of a light beam generation device fixing member used in the projection lens shown in FIG.

FIG. 13 is a schematic configuration diagram showing a configuration of a stack projection display device according to a sixth embodiment of the present invention.

FIG. 14 is a schematic configuration diagram showing a configuration when performing stack projection using two projection display devices.

[Explanation of symbols]

21,92,131 Light beam generator 22,136 Light beam generator fixing member 23,73 mounting ring 28 Semiconductor laser 29 Collimator lens 43, 81, 121 Projection lens barrel 51, 63, 71 Projection lens optical axis visualization device 52, 61, 76, 161, 162 Projection display device 53,62,77,167,168 Projection lens 55 V block 56, 64, 72 screens 65 plane mirror 91 prism type mirror 163 mount

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G03B 21/00-21/30 G03B 33/12 G02F 1/13 G02F 1/1335-1/13363 H04N 5 / 74

Claims (20)

(57) [Claims] 1. A projection lens optical axis visualization device comprising: a light beam generation means for emitting a visible light beam; and a mounting means for mounting the light beam generation means on a projection lens. 2. The mounting means is mounted at a position where a light beam travels on an optical axis of the projection lens when the light beam generating means is mounted on the projection lens. 1. The projection lens optical axis visualization device according to 1. 3. The mounting means causes the light beam emitted from the light beam generating means and a part of the projection image forming light emitted from the projection lens to reach the screen at the same time. The projection lens optical axis visualization device according to claim 1. 4. The projection lens optical axis visualization device according to claim 1, wherein the light beam generation means includes a laser that emits a visible light beam. 5. The light beam generation means includes a semiconductor laser that outputs visible light, and a collimator lens that converts the output light of the semiconductor laser into parallel light. Projection lens optical axis visualization device. 6. The projection according to claim 1, wherein the mounting means is rotatable about the central axis of the lens barrel of the projection lens after mounting the light beam generating means on the projection lens. Lens optical axis visualization device. 7. The projection lens optical axis visualization device according to claim 1, wherein the mounting means has an adjusting means for adjusting the emission direction of the light beam emitted from the light beam generating means. 8. A lens barrel, a lens group held in the lens barrel, for enlarging and projecting an image on a screen, and a light beam generating means for emitting a visible light beam traveling on the optical axis of the lens group. And a light beam emitted from the light beam generation means and a part of the projection image forming light reach the screen at the same time. 9. The projection lens according to claim 8, wherein the light beam generating means is arranged between two lenses of the lens group. 10. The projection lens according to claim 8, wherein the light beam generation means includes a laser that emits a visible light beam. 11. The light beam generating means comprises a semiconductor laser that outputs visible light, and a collimator lens that converts the output light of the semiconductor laser into parallel light. Projection lens. 12. The lens group is configured such that a part of the lens interval thereof can be changed, and the lens and the light beam generating means through which the light beam emitted from the light beam generating means does not pass. The projection lens according to claim 8, wherein the positional relationship is fixed. 13. A light source, a light valve to which light emitted from the light source is incident to form an optical image according to a video signal, and an optical image which is emitted from the light valve to enter and form an optical image on the light valve. A projection display device comprising: the projection lens according to claim 8 for projecting on a screen. 14. A light source, a light valve to which light emitted from the light source is incident to form an optical image according to a video signal, and an optical image which is emitted from the light valve to enter and form an optical image on the light valve. A projection type display device comprising: a projection lens for projecting on a screen; and a projection lens optical axis visualization device, which is attached to the projection lens and allows a visible light beam to travel along the optical axis of the projection lens. An installation adjustment method, wherein a projection lens optical axis visualization device is attached to the projection lens,
A method of installing and adjusting the projection display device, wherein the position or direction of the projection display device is adjusted so that the light beam output from the projection lens optical axis visualization device is projected at a predetermined position on the screen. . 15. The position of the projection lens with respect to the light valve is adjusted so that the light beam of the projection lens optical axis visualization device strikes a predetermined position of the projection image formed on the screen. 14. A method for installing and adjusting the projection display device according to 14. 16. A light source, a light valve on which light emitted from the light source is incident to form an optical image according to a video signal, and light emitted from the light valve is incident to form an optical image on the light valve. And a projection lens having a light beam generating means for projecting a light beam of visible light along the optical axis thereof, and a method of installing and adjusting the projection display device, comprising: A method for installing and adjusting a projection display device, characterized in that the position or direction of the projection display device is adjusted so that the light beam emitted from the lens hits a predetermined position on the screen. 17. The installation of the projection display device according to claim 16, wherein the position of the projection lens with respect to the light valve is adjusted so that the light beam strikes a predetermined position of the projection image formed on the screen. Adjustment method. 18. A method of installing and adjusting a projection display device having a projection lens for projecting an optical image on a screen, wherein the projection lens of the projection display device is a projection lens. A projection lens optical axis visualization device is mounted, a plane mirror is arranged close to the screen so that a reflection surface is parallel to the screen, and a light beam emitted from the projection lens optical axis visualization device is placed on the screen in a predetermined manner. The method for installing and adjusting the projection type display device is characterized in that the position and direction of the projection type display device are adjusted so that the light is reflected by the plane mirror at the position and returns to the central portion of the projection lens optical axis visualization device. . 19. A method for installing and adjusting a projection display device having a projection lens according to claim 8, wherein an optical image is projected on a screen, wherein the reflection surface is close to the screen. A plane mirror is arranged so as to be parallel to the screen, and the light beam emitted from the projection lens is reflected by the plane mirror at a predetermined position on the screen and returns to the central portion of the projection lens. A method of installing and adjusting a projection display device, comprising adjusting the position and direction of the projection display device. 20. A method of installing and adjusting a projection display device having a projection lens for projecting an optical image on a screen, wherein the projection lens optical axis visualization device according to any one of claims 1 to 7 is used as a screen. It is arranged at a predetermined position above so as to emit a light beam in a direction perpendicular to the screen, and the light beam emitted from the projection lens optical axis visualization device hits the central portion of the projection lens of the projection display device. The position of the projection display device is adjusted, the projection lens optical axis visualization device is attached to the projection lens, and the direction of the projection display device is adjusted so that the light beam strikes a predetermined position on the screen. A method of installing and adjusting a characteristic projection display device.